import org.apache.cassandra.streaming.messages.StreamMessage; //导入依赖的package包/类
@Override
public void run()
{
    try
    {
        // streaming connections are per-session and have a fixed version.  we can't do anything with a wrong-version stream connection, so drop it.
        if (version != StreamMessage.CURRENT_VERSION)
            throw new IOException(String.format("Received stream using protocol version %d (my version %d). Terminating connection", version, MessagingService.current_version));

        DataInput input = new DataInputStream(socket.getInputStream());
        StreamInitMessage init = StreamInitMessage.serializer.deserialize(input, version);

        // The initiator makes two connections, one for incoming and one for outgoing.
        // The receiving side distinguish two connections by looking at StreamInitMessage#isForOutgoing.
        // Note: we cannot use the same socket for incoming and outgoing streams because we want to
        // parallelize said streams and the socket is blocking, so we might deadlock.
        StreamResultFuture.initReceivingSide(init.sessionIndex, init.planId, init.description, init.from, socket, init.isForOutgoing, version);
    }
    catch (IOException e)
    {
        logger.debug("IOException reading from socket; closing", e);
        try
        {
            socket.close();
        }
        catch (IOException e2)
        {
            logger.debug("error closing socket", e2);
        }
    }
}
 

import org.apache.cassandra.streaming.messages.StreamMessage; //导入依赖的package包/类
/**
 * Set up incoming message handler and initiate streaming.
 *
 * This method is called once on initiator.
 *
 * @throws IOException
 */
public void initiate() throws IOException
{
    logger.debug("[Stream #{}] Sending stream init for incoming stream", session.planId());
    Socket incomingSocket = session.createConnection();
    incoming.start(incomingSocket, StreamMessage.CURRENT_VERSION);
    incoming.sendInitMessage(incomingSocket, true);

    logger.debug("[Stream #{}] Sending stream init for outgoing stream", session.planId());
    Socket outgoingSocket = session.createConnection();
    outgoing.start(outgoingSocket, StreamMessage.CURRENT_VERSION);
    outgoing.sendInitMessage(outgoingSocket, false);
}
 

import org.apache.cassandra.streaming.messages.StreamMessage; //导入依赖的package包/类
public void sendMessage(StreamMessage message)
{
    if (outgoing.isClosed())
        throw new RuntimeException("Outgoing stream handler has been closed");

    outgoing.enqueue(message);
}
 

import org.apache.cassandra.streaming.messages.StreamMessage; //导入依赖的package包/类
public void run()
{
    try
    {
        ReadableByteChannel in = getReadChannel(socket);
        while (!isClosed())
        {
            // receive message
            StreamMessage message = StreamMessage.deserialize(in, protocolVersion, session);
            // Might be null if there is an error during streaming (see FileMessage.deserialize). It's ok
            // to ignore here since we'll have asked for a retry.
            if (message != null)
            {
                logger.debug("[Stream #{}] Received {}", session.planId(), message);
                session.messageReceived(message);
            }
        }
    }
    catch (SocketException e)
    {
        // socket is closed
        close();
    }
    catch (Throwable t)
    {
        JVMStabilityInspector.inspectThrowable(t);
        session.onError(t);
    }
    finally
    {
        signalCloseDone();
    }
}
 

import org.apache.cassandra.streaming.messages.StreamMessage; //导入依赖的package包/类
@Override
public void run()
{
    try
    {
        // streaming connections are per-session and have a fixed version.  we can't do anything with a wrong-version stream connection, so drop it.
        if (version != StreamMessage.CURRENT_VERSION)
            throw new IOException(String.format("Received stream using protocol version %d (my version %d). Terminating connection", version, MessagingService.current_version));

        DataInput input = new DataInputStream(socket.getInputStream());
        StreamInitMessage init = StreamInitMessage.serializer.deserialize(input, version);

        // The initiator makes two connections, one for incoming and one for outgoing.
        // The receiving side distinguish two connections by looking at StreamInitMessage#isForOutgoing.
        // Note: we cannot use the same socket for incoming and outgoing streams because we want to
        // parallelize said streams and the socket is blocking, so we might deadlock.
        StreamResultFuture.initReceivingSide(init.planId, init.description, init.from, socket, init.isForOutgoing, version);
    }
    catch (IOException e)
    {
        logger.debug("IOException reading from socket; closing", e);
        try
        {
            socket.close();
        }
        catch (IOException e2)
        {
            logger.debug("error closing socket", e2);
        }
    }
}
 

import org.apache.cassandra.streaming.messages.StreamMessage; //导入依赖的package包/类
/**
 * Set up incoming message handler and initiate streaming.
 *
 * This method is called once on initiator.
 *
 * @throws IOException
 */
public void initiate() throws IOException
{
    logger.debug("[Stream #{}] Sending stream init for incoming stream", session.planId());
    Socket incomingSocket = connect(session.peer);
    incoming = new IncomingMessageHandler(session, incomingSocket, StreamMessage.CURRENT_VERSION);
    incoming.sendInitMessage(true);
    incoming.start();

    logger.debug("[Stream #{}] Sending stream init for outgoing stream", session.planId());
    Socket outgoingSocket = connect(session.peer);
    outgoing = new OutgoingMessageHandler(session, outgoingSocket, StreamMessage.CURRENT_VERSION);
    outgoing.sendInitMessage(false);
    outgoing.start();
}
 

import org.apache.cassandra.streaming.messages.StreamMessage; //导入依赖的package包/类
public void run()
{
    StreamMessage next;
    while (!isClosed())
    {
        try
        {
            if ((next = messageQueue.poll(1, TimeUnit.SECONDS)) != null)
            {
                logger.debug("[Stream #{}] Sending {}", session.planId(), next);
                sendMessage(next);
                if (next.type == StreamMessage.Type.SESSION_FAILED)
                    close();
            }
        }
        catch (InterruptedException e)
        {
            throw new AssertionError(e);
        }
    }

    try
    {
        // Sends the last messages on the queue
        while ((next = messageQueue.poll()) != null)
            sendMessage(next);
    }
    finally
    {
        signalCloseDone();
    }
}
 

import org.apache.cassandra.streaming.messages.StreamMessage; //导入依赖的package包/类
@Override
@SuppressWarnings("resource") // Not closing constructed DataInputPlus's as the stream needs to remain open.
public void run()
{
    try
    {
        // streaming connections are per-session and have a fixed version.
        // we can't do anything with a wrong-version stream connection, so drop it.
        if (version != StreamMessage.CURRENT_VERSION)
            throw new IOException(String.format("Received stream using protocol version %d (my version %d). Terminating connection", version, StreamMessage.CURRENT_VERSION));

        DataInputPlus input = new DataInputStreamPlus(socket.getInputStream());
        StreamInitMessage init = StreamInitMessage.serializer.deserialize(input, version);

        //Set SO_TIMEOUT on follower side
        if (!init.isForOutgoing)
            socket.setSoTimeout(DatabaseDescriptor.getStreamingSocketTimeout());

        // The initiator makes two connections, one for incoming and one for outgoing.
        // The receiving side distinguish two connections by looking at StreamInitMessage#isForOutgoing.
        // Note: we cannot use the same socket for incoming and outgoing streams because we want to
        // parallelize said streams and the socket is blocking, so we might deadlock.
        StreamResultFuture.initReceivingSide(init.sessionIndex, init.planId, init.description, init.from, this, init.isForOutgoing, version, init.keepSSTableLevel, init.isIncremental);
    }
    catch (IOException e)
    {
        logger.error(String.format("IOException while reading from socket from %s, closing: %s",
                                   socket.getRemoteSocketAddress(), e));
        close();
    }
}
 

import org.apache.cassandra.streaming.messages.StreamMessage; //导入依赖的package包/类
/**
 * Set up incoming message handler and initiate streaming.
 *
 * This method is called once on initiator.
 *
 * @throws IOException
 */
@SuppressWarnings("resource")
public void initiate() throws IOException
{
    logger.debug("[Stream #{}] Sending stream init for incoming stream", session.planId());
    Socket incomingSocket = session.createConnection();
    incoming.start(incomingSocket, StreamMessage.CURRENT_VERSION);
    incoming.sendInitMessage(incomingSocket, true);

    logger.debug("[Stream #{}] Sending stream init for outgoing stream", session.planId());
    Socket outgoingSocket = session.createConnection();
    outgoing.start(outgoingSocket, StreamMessage.CURRENT_VERSION);
    outgoing.sendInitMessage(outgoingSocket, false);
}
 

import org.apache.cassandra.streaming.messages.StreamMessage; //导入依赖的package包/类
@SuppressWarnings("resource")
public void run()
{
    try
    {
        ReadableByteChannel in = getReadChannel(socket);
        while (!isClosed())
        {
            // receive message
            StreamMessage message = StreamMessage.deserialize(in, protocolVersion, session);
            logger.debug("[Stream #{}] Received {}", session.planId(), message);
            // Might be null if there is an error during streaming (see FileMessage.deserialize). It's ok
            // to ignore here since we'll have asked for a retry.
            if (message != null)
            {
                session.messageReceived(message);
            }
        }
    }
    catch (Throwable t)
    {
        JVMStabilityInspector.inspectThrowable(t);
        session.onError(t);
    }
    finally
    {
        signalCloseDone();
    }
}
 

import org.apache.cassandra.streaming.messages.StreamMessage; //导入依赖的package包/类
/**
 * Set up incoming message handler and initiate streaming.
 *
 * This method is called once on initiator.
 *
 * @throws IOException
 */
public void initiate() throws IOException
{
    logger.debug("[Stream #{}] Sending stream init for incoming stream", session.planId());
    Socket incomingSocket = connect(session.peer);
    incoming.start(incomingSocket, StreamMessage.CURRENT_VERSION);
    incoming.sendInitMessage(incomingSocket, true);

    logger.debug("[Stream #{}] Sending stream init for outgoing stream", session.planId());
    Socket outgoingSocket = connect(session.peer);
    outgoing.start(outgoingSocket, StreamMessage.CURRENT_VERSION);
    outgoing.sendInitMessage(outgoingSocket, false);
}
 

import org.apache.cassandra.streaming.messages.StreamMessage; //导入依赖的package包/类
/**
 * Enqueue messages to be sent.
 *
 * @param messages messages to send
 */
public void sendMessages(Collection<? extends StreamMessage> messages)
{
    for (StreamMessage message : messages)
        sendMessage(message);
}
 

import org.apache.cassandra.streaming.messages.StreamMessage; //导入依赖的package包/类
public int compare(StreamMessage o1, StreamMessage o2)
{
    return o2.getPriority() - o1.getPriority();
}
 

import org.apache.cassandra.streaming.messages.StreamMessage; //导入依赖的package包/类
public void enqueue(StreamMessage message)
{
    messageQueue.put(message);
}